[Patrick]

Without going into too much detail, I can inject an RF signal at various frequencies down to 500Hz (with var. cap fully meshed), and tune to that frequency, at which point I can adjust both the 1st and 2nd IF cans. But I get nothing when I try to inject the 460 Hz IF.

Can something be preventing me from hearing anything below 500Hz? Only tried it by ear so far.

I'll post a schematic if needed, but I thought this just might be a general question.

Thanks.